Tube and rod tapering



L. H. BRINKMAN.

TUBE AND ROD TAPERING;

APPLICATION FILED FEB. 11, I919.

Patentgd June 6, 1922.

2 SHEETS-SHEET l- L. H. BRINKMAN. TUBE AND ROD TAPERING.

APPLICATIQN FILED FEB. I1. 919.

Patented. June 6,1922.

2 SHEETS-SHEET Z.

moms n. Jamaican, "or ermmmen, new JERSEY, assume are, no GENERALsEAMLEss TUBE A oonrona'rron or 'nELAwE.

1,418,?1 Specification of Turn AND non rarnnme.

L t r P n I Patented June 6, 1922.

Application and February 11, 1919. Serial. 1%. 276,321.

To all whom it may concern:

Be it known that I, LOUIS H. BRINKMAN, a citizen of the United- Statesof America, residing at-Glenridge,- Essex County, and State of NewJersey, have invented new and useful Improvements in Tube and. RodTapering, of which the following is a spec1-- fication. This inventionrelates tothe drawing of rods or tubes by means of ball dies andespeciallyto such drawing where the radius of the die is varied as thework progresses through it so that the work may be made longitudinallytapering or otherwise to vary in diameter or thickness or both. It is tobe understood, however, that the invention is not limited to tapering.or forming the work of. varying diameters or thickness, nor to balldies, as it may have other applications. It is one object of the presentinvention to provide'm'eans whereby the diameter of the pass is variedin a predetermined ratio to the longitudinal movement of the die andwork with relation to each other.

Adiurther object of the invention is to 1 provide means forautomatically efiecting the variation of the diameter of the pass.

A further object of the invention is automatic means for varying thediameter of he pass, this means being operated by the re a'-.

. tive movement of the pass and work.

- A further object of the invention is to provide an improved structureof adjustable sci-tau die.

Other and ancillary objects of the invention will appear hereinafter.

In the accompanying drawings which illustrate the invention- Y Figure lis a side'elevation of apparatus embodying the invention;

Fig. 2 is a top plan view of the apparatus ofF1g.1;' Fig. 3 is a centrallongitudinal section on as an enlarged scale 'of the die and adjacentparts, the remainder .of the apparatus belng broken away, this sectionbeing taken on the line 3-3 of Fig.4, and

Fig. 4 isa section on the line 4-4: of mFi.

ferring to the drawings, the apparatus comprises a bed 1 suitablysupported by blocks or legs 2 and 3. Upstanding from the bed at one endis abracket or head-piece 4 crease its diameter.

from which extend rods or bars 5, 6, 7 and .8, these bars extendingthrough other uprights 9 and 10, which support a hydraulic cylinder 11.The piston rod 12 ofthe hydraulic cylinder has secured to it a crosshead 13 to which are secured bars or rods 14 and 15 which are alsosecured to the easing'16 of the ball die which is slidably mounted uponthe bars 5, the die may be slid longitudinally of the machine by meansof the hydraulic cylinder which maybe supplied with fluid and controlledin a manner well understood.

The casin 16 of the die has a central opening 17 t rough which the work18 may be passed. About this opening is an in- 6, 7 and 8 so that turnedflange 19 which has mounted within it a hard steel ring. 20 forming alateral bearing surface for the series of hard steel balls 21 which.contact with the work and form the working members of the die. On theopposite side of the series of balls, is a similar hard steel ring 22mounted in the inturned flange 23 of the circular head 24 which isscrewed into the casing. By turning this head in one direction or theother, ad ustment of the distance between the rings 20 and 22 may bemade so that they may be adapted to the desired fit .of the balls. Itwill be noted that the inner edges of the rings 20 and 22 projectinwardly of the die beneath the centers of the balls sothat the ballsare prevented from falling out of the die. Encircling the series ofballs is a ring 25 having its interior surface which bears upon theballs tapered longitudinally of the Work so that by shifting this ringongitu- 'dinally', the balls are-either forced inwardly A so as todecrease the diameter of the pass or are allowed to move outwardly so asto in- The ring 25 is provided, upon its outer ries of circumferentialteeth 26 with which mesh, upon opposite sides of the ring, spur gears 27and'28 which are respectively fixed upon the shafts 29 and 30 rotatablymounted periphery, with a sein the .die casing. Each of the gear teeththe ends" of. links 33 and filwhich are -26 extends around an entirecircumference also pivoted to the frame at 35 and 36. The result is thatas the die or pass is longitudinally moved. the shafts 2-9 and 30 arering 25 bears a certain .pre-determined relation to the movement of thedie and this may be made any that is desired by a proper adjustment. Aconvenient manner of effecting the adjustment is provided in the prescutinstance 'by providing a plurality of holes 35' and 36' in the arms 31'and 32 respectively whereby the arms 33 and 34 may be pivoted.- Bysuitablyselecting the holes the lengths of the arms 31 and 32 may bemade any desired which will produce the desired ratio of movement of thering 25 to that of the die.

The work, such as the tube 18 is tightly gripped in a suitable chuck37which secures the work to the shaft of an electric motor 38. This motormay be of any suitable type, either alternating or direct current and issupported by having its frame slidably' mounted upon bars. 5 and 6. Itisheld against longitudinal movement during the drawing operation bymeans of the thrust bleaping 39 into which extends the motor s a t.

To steady the work, a plate or collar 40 is removably secured to thehead 24, this plate having a central hole adapted to loosely fit thework. Different diameters of work may be accommodated by removing theplate 40 and introducing another one of suitable size'when'ever thediameter of the work changes.

A series of passages 41 extend through the die-casing an afford a meanswhereby cooling fluid, as water may be introduced upon the advanced sideof the balls, side of the balls after the work has been'operated upon bythe pass. The water so introduced trickles down and cools the tubeimmediately after it has been reduced by passing under the balls,thereby causing it to hold its shape and not be crushed by the inwardmovement of the balls to decrease the succeeding sections in thetapering operation. f

The operation of the apparatus may be briefly traced as fo1lows-'- I Thetube to be tapered having been" secured in the chuck 37 and. theworkintroduced into' the die, the motor 38 may be started in to rotation andthe fluid pressure cylinder 11operatd to-draw the pass that is, the

When a length of tube has been operated upon to a desired extent, thework may be removed and the die returned to its left hand position (seeFigs. 1 and 2), a new length of tube placed in position and theoperation as described repeated indefinitely.

While the invention has been illustrated in what is considered its bestembodiment, it-

may have other embodiments without departing from the spirit and is not,therefore,

limited-to the structure shown in the drawings." v

-What I claim is- 1. In metal drawing apparatus, the combination with aframe of a motor thereon, a

chuck driven thereby for securing the work in driving relation to theshaft of said motor, said work being co-axial with said shaft,

a thrust bearing for resistinglongitudinal movement of said shaft andwork, a die or pass adapted to act upon the work and comprising acasing, balls encircling the work and ball positioning means comprisinga ring encircling the balls and having its ball engaging surface taperedlongitudinally of 'the work, gear teeth upon said ring, a gear engagingwith said gear teeth, a shaft mounted in said casing and upon which saidgear is mounted, a crank arm extending from the last mentioned shaft, alink from said crank arm to said frame, a fluid pressure cylinder andmeans connecting said die or pass with said cylinder for moving the saiddie along said frame. 2. In metal drawing apparatus, the combinationwith means for supporting the work, of a die or pass through which thework is passed, means for relatively movin said pass and worklongitudinally of the latter, -means for relatively rotating the workand pass, said pass comprising a se- .ries of balls to encircle the workand posi; tioning means for said balls, said positioning meanscomprising a ring encircling the balls and said ring being adaptedtovihove the balls inwardly as it is moved longitudinally of the workand means for moving the said ring longitudinally of the work in apre-determined ratio to the relative longitudinal movement of the passand work.

3. In metal drawing apparatus, the combination with means for supportingthe work, of a die or pass thro h whichthe work is passed, means for reatively moving said pass and work longitudinally'of the latter, meansfor relatively rotating the work and pass, said pass comprising a seriesof balls to encircle the work .and po-;

ing a reducing motion for moving the said ring longitudinally of thework in a predetermined ratio to the relativelongitudinal movement ofthe pass and work,,the said reducing motion producing a less movement-.of the ring than the corresponding movement of the pass with relationto the work.

4:. In metal drawing apparatus, the combination with means forsupporting the work, of a die or pass through which the work is passed,means for relatively moving said pass and work longitudinally of thelatter, means for relatively rotating the work and pass, said passcomprising a series ofballs encircling the work and positioning meansfor said balls, and means for adjusting the said positioning means in apredetermined ratio to the relative longitudinal movement of the passand work, to force said balls inwardly.

5. 'In metal drawing apparatus, theicombination with means forsupporting the work, of a die or pass through which the work is passed,means for relatively moving said pass and work longitudinally of thelatter, means for relatively rotating the work and pass, said passcomprising a series of balls encircling the work and positioning meansfor said balls, and 'means for adjusting the said positioning meanscomprising a connection between said positioning means and the frame ofthe apparatus whereby the relative longitudinal movement of the die andwork causes movement of said positioning means to vary the diameter ofthe die.

6. The combination with a pass comprising a series of balls adapted toact upon the work and a ball raceway including a tapered ring encirclingthe balls and longitudinally movable with relation to the remainder ofthe raceway, a support on which the pass is slidable axially of thepass,means for rotating the work in said pass, means for moving saidpass longitudinally and means for moving said tapered ring to vary thediameter of the pass.

7. The combination with a pass comprising a series of balls adapted toact upon the work and a ball raceway including a tapered ring encirclingthe balls and longitudinally movable with relation to the remainder ofthe raceway, a support on which the pass is slidable axially of thepass,,means for rotating the work in said pass, means for moving saidpass longitudinally and means operated by relative movement of the passand work for longitudinally moving said tapered ring to vary thediameter of the pass.

8. A ball die comprising a casing, a series of balls within said casing,a raceway for said balls comprising a ring on said casing at each sideof the said series of balls and a longitudinally tapered ring encirclingsaid balls and gearing engaging with the last -mentioned ring toadjustably position it longitudinally of the die.

In testimony whereof I have signed this specification this 31st day ofJanuary, 1919.

LOUIS H. BRINKMAN.

